Sharp Microwave Error Code EE27

EE27 means the control board has detected that magnetron 2 (MG2) has exceeded its maximum safe operating temperature. The microwave shuts down automatically to prevent damage to the magnetron and surrounding components. The fault points to either a cooling system problem or a faulty thermistor on MG2. The unit will not resume normal operation until the thermal issue is resolved.

No. EE27 is a thermal protection fault and the microwave disables itself for a reason. Bypassing or ignoring this fault and continuing to operate the unit could cause permanent damage to MG2 or create a fire hazard. Do not attempt to defeat the safety shutoff. Allow the unit to cool fully and address the underlying cause before running it again.

Repair costs vary depending on the failed component. A replacement cooling fan typically falls in the range of $20 to $60 for parts, while a new thermistor is generally less expensive. If magnetron 2 itself has failed, parts and labor combined can range from $150 to $350 or more, which may approach the replacement cost of some models. Getting a diagnostic estimate from a technician before committing to a magnetron replacement is advisable.

Some causes of EE27 are accessible to a knowledgeable DIYer, such as clearing blocked vents or cleaning magnetron cooling fins. However, testing a thermistor, replacing a cooling fan, or diagnosing a failing magnetron requires comfort working inside a microwave with high-voltage components. If you are not experienced with appliance repair, a qualified technician is the safer choice.

Unplugging the microwave and allowing it to cool may temporarily clear the fault, but EE27 will return if the root cause is not corrected. A failed cooling fan, blocked vents, or a faulty thermistor will trigger the code again as soon as MG2 reaches the temperature threshold. A reset is only a useful first step to confirm the fault and allow cool-down, not a repair.